Characteristics of Sumatran Coffee - Legendary Flavors from Indonesia's Renowned Growing Regions

FrontStreet Coffee: an introduction to Sumatra coffee

Asia has vast landmasses and a wide range of coffee varieties across its growing regions. The best known include Indonesia, where coffee is recognized for its distinctive smoky sensation and its herbal, spicy notes, and Vietnam, whose beans have evident fruit flavors and a thick body. Vietnam produces mainly Robusta, a variety characterized chiefly by bitterness and a less aromatic profile.

In 1696 the Dutch governor of Malabar in India sent a batch of coffee seedlings to the Dutch governor of Batavia, now Jakarta, marking the first cultivation of coffee in Indonesia. That first batch was washed away by floods, however. In 1699 Batavia received another gift, and this time the seedlings survived and produced their first harvest in 1701, beginning Indonesia's coffee journey.

Initially coffee was cultivated in Jakarta and the surrounding areas. The growing areas gradually expanded to central and eastern Java, and Sulawesi, Sumatra, and Bali also began to grow coffee. Meanwhile, in eastern Indonesia, Flores and Timor, Portuguese territories at the time, also cultivated coffee, though the sources of their seedlings were different.

Sumatra has three main growing regions: Aceh in the north, the area slightly south of Lake Toba, and the more recently emerged islands near Mangkuraja. Smaller areas can be traced as well: Takengon and Bener Mariah in Aceh Province, and Lintong, Sidikalang, Dolok Sanggul, and Seribu Dolok around Lake Toba. Coffee sold from this region was once collectively called "Sumatra Mandheling," but in reality there is no place called Mandheling. The name comes from the ethnic name of the local islanders.

Mandheling is typically graded Grade 1 or Grade 2. The grading method unquestionably uses cupping quality rather than the raw beans themselves. There are grounds for doubt about recommending Grade 1 as a guide, though, since the label has become almost ubiquitous. Dividing different varieties into different batches is odd, so most Sumatra beans are blends of unknown varieties. Sumatra coffee is exported through the port of Medan, and if it sits at the port too long before export, the hot, humid climate works against the quality of the beans.

Altitude: Aceh 1100-1300m, Lake Toba 1100-1600m, Mangkuraja 1100-1300m

Harvest: September-December

Varieties: Typica (including Bergandal, Sidikalang, Djember), Timtim, Ateng, Onan Gajang

FrontStreet Coffee Recommendation

Sumatra's reputation rests on a method that no other origin quite shares. Because the rainy season overlaps with the harvest, growers cannot dry coffee in the sun the way African producers do. So they remove the pulp, give the beans a short fermentation and drying, and then hull the parchment off while the beans are still half-dry, leaving the naked seeds exposed to the humid air. That is where the low acidity, heavy body, and cedar-herbal aroma come from.

FrontStreet Coffee's Indonesian range begins with that method. The classic first choice is FrontStreet's Mandheling, and the natural place to start is Sumatra. The Lintong growing area around Lake Toba provides the beans, and the wet-hulled process gives them the typical herbal and spice character; roasted medium-dark to present the classic profile, the coffee is low in acidity and full in body, with caramel, dark chocolate, and toasted bread aromas and a long sweet finish, which makes it a natural fit for anyone who likes a strong cup. Above it sits the PWN Golden Mandheling. PWN buys high-quality Mandheling green beans locally, and Golden Mandheling is its signature product; sorting follows strict standards for defects, density, size, shape, and color, and the beans pass one machine selection and hand-sorting so they come out complete, even, large, and translucent with the earthy and grassy notes reduced. Legend says they glisten golden in the sun, which is where the name came from. Freshly roasted, the PWN Golden Mandheling shows sandalwood, herbs, spice, roasted hazelnut, caramel, and dark chocolate, with a clean finish, rich body, and a layered aroma. For an espresso machine or moka pot, FrontStreet's Classic Blend adds a small amount of Robusta to the original recipe and roasts deep, so the black chocolate, nut, and caramel notes come through fully and even a beginner can pull a proper Mandheling-style shot.

Sumatran coffee is roasted on the darker side, so treat it gently: keep the water temperature a little lower than you would for a light roast, pour slowly, and avoid stirring up the bed. The goal is to draw out the caramel sweetness and full body while keeping the burnt edges out of the cup.